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Control of Electron State Coupling in Asymmetric Ge/GeSi Quantum Wells

Ciano, Chiara; Virgilio, Michele; Montanari, Michele; Persichetti, Luca; Di Gaspare, Luciana; Ortolani, Michele; Baldassarre, Leonetta; Zoellner, Marvin H.; Skibitzki, Oliver; Scalari, Giacomo; Faist, Jerome; Paul, Douglas J.; Scuderi, Mario; Nicotra, Giuseppe; Grange, Thomas; Birner, Stefan; Capellini, Giovanni; De Seta, Monica


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  <identifier identifierType="DOI">10.5281/zenodo.2319242</identifier>
  <creators>
    <creator>
      <creatorName>Ciano, Chiara</creatorName>
      <givenName>Chiara</givenName>
      <familyName>Ciano</familyName>
    </creator>
    <creator>
      <creatorName>Virgilio, Michele</creatorName>
      <givenName>Michele</givenName>
      <familyName>Virgilio</familyName>
    </creator>
    <creator>
      <creatorName>Montanari, Michele</creatorName>
      <givenName>Michele</givenName>
      <familyName>Montanari</familyName>
    </creator>
    <creator>
      <creatorName>Persichetti, Luca</creatorName>
      <givenName>Luca</givenName>
      <familyName>Persichetti</familyName>
    </creator>
    <creator>
      <creatorName>Di Gaspare, Luciana</creatorName>
      <givenName>Luciana</givenName>
      <familyName>Di Gaspare</familyName>
    </creator>
    <creator>
      <creatorName>Ortolani, Michele</creatorName>
      <givenName>Michele</givenName>
      <familyName>Ortolani</familyName>
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    <creator>
      <creatorName>Baldassarre, Leonetta</creatorName>
      <givenName>Leonetta</givenName>
      <familyName>Baldassarre</familyName>
    </creator>
    <creator>
      <creatorName>Zoellner, Marvin H.</creatorName>
      <givenName>Marvin H.</givenName>
      <familyName>Zoellner</familyName>
    </creator>
    <creator>
      <creatorName>Skibitzki, Oliver</creatorName>
      <givenName>Oliver</givenName>
      <familyName>Skibitzki</familyName>
    </creator>
    <creator>
      <creatorName>Scalari, Giacomo</creatorName>
      <givenName>Giacomo</givenName>
      <familyName>Scalari</familyName>
    </creator>
    <creator>
      <creatorName>Faist, Jerome</creatorName>
      <givenName>Jerome</givenName>
      <familyName>Faist</familyName>
    </creator>
    <creator>
      <creatorName>Paul, Douglas J.</creatorName>
      <givenName>Douglas J.</givenName>
      <familyName>Paul</familyName>
    </creator>
    <creator>
      <creatorName>Scuderi, Mario</creatorName>
      <givenName>Mario</givenName>
      <familyName>Scuderi</familyName>
    </creator>
    <creator>
      <creatorName>Nicotra, Giuseppe</creatorName>
      <givenName>Giuseppe</givenName>
      <familyName>Nicotra</familyName>
    </creator>
    <creator>
      <creatorName>Grange, Thomas</creatorName>
      <givenName>Thomas</givenName>
      <familyName>Grange</familyName>
    </creator>
    <creator>
      <creatorName>Birner, Stefan</creatorName>
      <givenName>Stefan</givenName>
      <familyName>Birner</familyName>
    </creator>
    <creator>
      <creatorName>Capellini, Giovanni</creatorName>
      <givenName>Giovanni</givenName>
      <familyName>Capellini</familyName>
    </creator>
    <creator>
      <creatorName>De Seta, Monica</creatorName>
      <givenName>Monica</givenName>
      <familyName>De Seta</familyName>
    </creator>
  </creators>
  <titles>
    <title>Control of Electron State Coupling in Asymmetric Ge/GeSi Quantum Wells</title>
  </titles>
  <publisher>Zenodo</publisher>
  <publicationYear>2018</publicationYear>
  <dates>
    <date dateType="Issued">2018-12-16</date>
  </dates>
  <resourceType resourceTypeGeneral="JournalArticle"/>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://zenodo.org/record/2319242</alternateIdentifier>
  </alternateIdentifiers>
  <relatedIdentifiers>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsSupplementedBy">10.5281/zenodo.2319402</relatedIdentifier>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsIdenticalTo">10.1103/PhysRevApplied.11.014003</relatedIdentifier>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsVersionOf">10.5281/zenodo.2319241</relatedIdentifier>
  </relatedIdentifiers>
  <rightsList>
    <rights rightsURI="https://creativecommons.org/licenses/by/4.0/legalcode">Creative Commons Attribution 4.0 International</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
  </rightsList>
  <descriptions>
    <description descriptionType="Abstract">&lt;p&gt;&lt;em&gt;Theoretical predictions indicate that the n-type Ge/SiGe multi quantum-well system is the most promising material for the realization of a Si-compatible THz quantum cascade laser operating at room temperature. To advance in this direction, we study both experimentally and theoretically asymmetric coupled multi quantum-well samples based on this material system, that can be considered as the basic building block of a cascade architecture. Extensive structural characterization shows the high material quality of strain-symmetrized structures grown by chemical vapor deposition, down to the ultrathin barrier limit. Moreover, THz absorption spectroscopy measurements supported by theoretical modeling unambiguously demonstrate inter-well coupling and wavefunction tunneling. The agreement between experimental data and simulations allowed us to characterize the tunneling barrier parameters and, in turn, achieve a highly-controlled engineering of the electronic structure in forthcoming unipolar cascade systems based on n-type Ge/SiGe multi quantum-wells.&lt;/em&gt;&lt;/p&gt;</description>
  </descriptions>
  <fundingReferences>
    <fundingReference>
      <funderName>European Commission</funderName>
      <funderIdentifier funderIdentifierType="Crossref Funder ID">10.13039/100010661</funderIdentifier>
      <awardNumber awardURI="info:eu-repo/grantAgreement/EC/H2020/766719/">766719</awardNumber>
      <awardTitle>Far-infrared Lasers Assembled using Silicon Heterostructures</awardTitle>
    </fundingReference>
  </fundingReferences>
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